Tomoyuki Oka (岡 倫之, Oka Tomoyuki; born June 12, 1991), better known by his ring name Great-O-Khan (グレート-O-カーン, Gurēto-Ō-Kān), is a Japanese professional wrestler. He is signed to New Japan Pro-Wrestling (NJPW), where he is a member of the United Empire stable. In NJPW, O-Khan is a former one-time NEVER Openweight 6-Man Tag Team Champion with Henare and Will Ospreay, a former NJPW World Television Champion, the final official KOPW Champion and a five-time IWGP Tag Team Champion, (twice with Jeff Cobb, twice with Henare, and once with Callum Newman).
Source: “Great-O-Khan”, English Wikipedia (CC BY-SA 4.0), excerpt